Upstairs air vent blocked. Auto vent on scoop is leaking, the fill valve was not on. Replaced 2nd floor bleeder with Auto air vent. Replaced scoop air vent, replaced expansion tank. Filled system and adjusted pressure. Cleaned system. Very dirty. 2" of rust and soot under burners. Cleaned flame sensor and ignitor. Checked and adjusted gas pressures. All loops are returning hot. Complete.
